100-V power MOSFETs bring yet more economy

San Jose, Calif.—Infineon says its OptiMOS 2 family of 100-volt MOSFETs, 20-strong now and 40 more expected shortly, can reduce switching losses by 20 percent, and parts count in a switched mode supply by 30 percent, as compared to traditional solutions. The family features an RDS as low as 4.4 milliohms in standard packages, and a figure of merit (i.e., the product of on-state resistance and gate charge) as low as 410 milli-nC to support switching speeds of 250 kHz and above, both of which the company says are industry-best. Applications include Class D amplification, motor-control, and uninterruptible power supplies.

In DC/DC converter applications, the MOSFETs' low on-state resistance will reduce conduction losses at high
loads. At light loads, the devices' very low FOMg (gate
charge figure of merit, i.e., on-state resistance
times gate charge) and FOMgd (gate-drain charge
figure of merit, i.e., on-state resistance times
gate-drain charge) will reduce the switching losses of
primary-side switches in isolated DC/DC brick
converters for high efficiency. Designers can expect a 20 percent cut in losses at full load with the same parts count, and better efficiency at light loads, according to the company. Alternatively, designers can cut parts count by 20 percent for the same efficiency.

In AC/DC converter applications, the MOSFETs are designed to provide the best mix of low on-state
resistance and gate charge with high
immunity to dynamic turn-on for lowest conduction losses and and safe operation in the synchronous rectification stage. In this case, designers can expect a 30 percent reduction in parts count on the secondary side. In addition, the MOSFETs' low thermal coefficient
ensures low conduction losses even at the
elevated temperatures normally present in AC/DC switched mode supplies.

The OptiMOS 2 also features an avalanche rating that is at the theoretical maximum for MOSFET technology, according to the company. Engineering samples of the new OptiMOS 2 devices in TO-252 (D-Pak), TO-262 (I2PAK) and TO-220 packages, with on-state resistances of from 5.4 to 80 milliohms, are available now. Additional package types, including D2PAK, IPak and Super SO-8 packages, are planned for release during this year.

Click here for additional device information. The MOSFETs are priced at less than $2.40 each in 10k quantities for a IPP04CN10N (4.4 milliohm, TO-220) device and less than 40 cents for a high-speed IPD64CN10N, D-PAK device.